21 Jan
2009
21 Jan
'09
9:30 a.m.
Wow. This is a cool point of view on monads, thank you for enlightening (the arrow stuff is yet too difficult for me to understand)! 2009/1/21 Andrzej Jaworski <himself@poczta.nom.pl>:
Monads are monoids in categories of functors C -> C Arrows are monoids in subcategories of bifunctors (C^op) x C -> C Trees are a playing ground for functors in general:-)
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